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Russell H.
Russell H., Service Tech
Category: Car Electronics
Satisfied Customers: 10909
Experience:  8+ years of professional experience
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Have an 86 Mitsubishi Montero 4spd. While attaching trailer

Customer Question

Have an 86 Mitsubishi Montero 4spd. While attaching trailer lighting harness vehicle rear lights no longer function even when detached from trailer, now. all fuses have been replaced and bulbs checked and still no rear tail light signals, no brake lights.
Submitted: 1 year ago.
Category: Car Electronics
Expert:  Russell H. replied 1 year ago.

Hi, thank you for contacting My name is Russell. I will do my best to provide the right answer to your question.

If the fuses are not the problem, if the bulbs are not the problem, then what's left?

- the sockets (though I doubt that.)

- the switches

- the ground connections or other connections, anywhere in the circuit.

Do you have a voltmeter? it can be very useful in a case like this, to verify whether voltage is, or is not, reaching any given point (whether its not reaching a point is owing to connections, wiring, switches, etc.

Customer: replied 1 year ago.
What I don't understand is how the turn signal and brake lights were working prior to my connecting trailer but now do not work, at all. Headlights and rear lights functional when turning on headlight switch. (?)What could have caused this?
Expert:  Russell H. replied 1 year ago.

Is the trailer hookup still hooked up?

If so, overloads & blown fuses, wires crossed and shorting things out, etc., could all be causes.